javascript - JavaScript setTimeout 不起作用

Question

我想要一个 JavaScript 函数在页面加载后 60 秒运行。经过一番研究，我发现 setTimeout() 是解决方案。

所以这就是我所做的：

<body onLoad="setTimeout(postAction('news.reads', 'article'), 60000);">

不知何故， setTimeout 不起作用。页面加载后，无需等待 60 秒，因为 postAction() 会立即运行。

为什么会这样？如何解决？那里有 setTimeout() 的替代品吗？谢谢！

score 11 · Accepted Answer

You need to wrap postAction in a function to defer execution:

setTimeout(function() { postAction('news.reads', 'article'); }, 60000);

You are actually executing postAction immediately, your code is equivalent to:

var result = postAction('news.reads', 'article');

setTimeout(result, 60000);

score 0 · Accepted Answer

您是否使用setTimeout类似：

setTimeout(function(){alert("OK");}, 1000 * 60); // alert "OK" in 60s

score 0 · Accepted Answer

在 JS 中做你想做的事情的正确方法，即在页面加载后设置超时：

(function(w)
{
    var load = function()
    {
         setTimeout(postAction,60000);
         if (w.removeEventListener)
         {//remove listeners, to avoid leak...
             return w.removeEventListener('load',load,false);
         }
         return w.attachEvent('onload',load);
    };
    if (w.addEventListener)
    {
        return w.addEventListener('load',load,false);
    }
    return w.attachEvent('onload',load);
}(this));

而不是window.onload = function(){setTimeout(postAction,60000);};, 这也可以，但会导致 IE <9 中的内存泄漏。那只是为了完整起见
无论如何，这里的关键是setTimeout(postAction,60000);

Update
After seeing the code you're using, this is the easiest fix:

<body onLoad="setTimeout(function(){ return postAction('news.reads', 'article');}, 60000);">

score -2 · Accepted Answer

<script>
        function doSomeJavascript() {
            // javascript code goes here
           alert('5 secs is up!');
        }
        // calls function doSomeJavascript() 5 secs after page load
        var interval = setInterval(doSomeJavascript, 5000);

        setTimeout(function() {
           window.clearInterval(interval);
        }, 5000);
</script>

javascript - JavaScript setTimeout 不起作用

4 回答 4

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